Renfert SILENT Guia De Inicio Rapido página 23

4.6 Checking function
After assembly, check the leak-tightness of the suction route and the function of the SILENT flow sensor.
♦ The SILENT flow sensor is connected to a socket.
♦ The green operating indicator (9) lights up�
♦ The yellow indicator for the defined threshold value lights up (5, 6, 7).
⇒ Switch suction on�
♦ The green operating indicator begins to flash.
♦ The yellow indicator for the defined threshold value lights up.
⇒ Close part of the suction mouth with your hand so that the flow rate drops below the defined threshold
value�
♦ After a short time, the indicator for the corresponding threshold value starts to flash.
♦ The warning tone is output after approx� 30 seconds�
⇒ Pay attention to noises that could indicate leakage�
⇒ Release the suction mouth again and continue to suction for approx� 30 seconds�
♦ The indicator for the corresponding threshold value lights up steadily�
♦ The warning tone is no longer output�
⇒ Switch off the extraction unit.
5 Operation
5.1 Operation
If the SILENT flow sensor detects a flow rate at the suction point, the green operating indicator flashes
slowly (9, Fig� 1)�
As long as the flow rate is higher than the defined threshold value, the corresponding indicator remains lit
up (5, 6, 7, Fig� 4)
If the flow rate is less than the defined threshold value for a certain period, the corresponding indicator
begins to flash and a warning tone is output every 30 seconds.
If the flow rate is too low at the suction point being monitored, safe operation is no longer guaran-
teed and the level of exposure to dust can be harmful to health!
In this case, the following measures must be taken:
⇒ Stop working at all suction points of the affected extraction unit. This applies to the individual suction
channels of any multi-workbench extraction unit as well as to all suction points operated via a Y-junction
or via extractor switches�
⇒ Determine why the flow rate is too low and resolve the issue.
Suction level is too low.
In the case of multi-workbench extraction units: the
suction power is too low because an additional suc-
tion channel has been connected.
Filter blockage
Changing the filter bag / cleaning the filter do not
result in the expected improvement.
Blockage in the suction point (suction mouth).
Cause
- 9 -
Measure
• Choose a higher suction level
• Stop working with the additional suction channel�
• In the case of extraction units with a pre-filter (filter
bag): change the filter bag. When doing so, observe
the instructions and the safety information for the cor-
responding extraction unit�
• In the case of extraction units without a filter bag: clean
the filter.
• Change the fine filter.
• When doing so, observe the instructions and the safe-
ty information for the corresponding extraction unit in
order to ensure that changing the fine filter results in as
little dust as possible�
• Disconnect the suction hose at the suction point and
check whether there is a blockage in the suction point;
remove where appropriate�
en